The VPN Gateway must be configured to prohibit the use of all unnecessary and/or nonsecure functions, ports, protocols, and/or services, as defined in the PPSM CAL and vulnerability assessments.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-207204	SRG-NET-000132-VPN-000450	SV-207204r608988_rule		Medium

Description
In order to prevent unauthorized connection of devices, unauthorized transfer of information, or unauthorized tunneling (i.e., embedding of data types within data types); organizations must disable or restrict unused or unnecessary physical and logical ports/protocols on information systems. DoD continually assesses the ports, protocols, and services that can be used for network communications. Some protocols or services have known exploits or security weaknesses. Network traffic using these ports, protocols, and services must be prohibited or restricted in accordance with DoD policy. The PPSM CAL and vulnerability assessments provide an authoritative source for ports, protocols, and services that are unauthorized or restricted across boundaries on DoD networks. The VPN Gateway must be configured to prevent or restrict the use of prohibited ports, protocols, and services throughout the network by filtering the network traffic and disallowing or redirecting traffic as necessary. Default and updated policy filters from the vendors will disallow older version of protocols and applications and will address most known non-secure ports, protocols, and/or services.

Description

In order to prevent unauthorized connection of devices, unauthorized transfer of information, or unauthorized tunneling (i.e., embedding of data types within data types); organizations must disable or restrict unused or unnecessary physical and logical ports/protocols on information systems. DoD continually assesses the ports, protocols, and services that can be used for network communications. Some protocols or services have known exploits or security weaknesses. Network traffic using these ports, protocols, and services must be prohibited or restricted in accordance with DoD policy. The PPSM CAL and vulnerability assessments provide an authoritative source for ports, protocols, and services that are unauthorized or restricted across boundaries on DoD networks. The VPN Gateway must be configured to prevent or restrict the use of prohibited ports, protocols, and services throughout the network by filtering the network traffic and disallowing or redirecting traffic as necessary. Default and updated policy filters from the vendors will disallow older version of protocols and applications and will address most known non-secure ports, protocols, and/or services.

STIG	Date
Virtual Private Network (VPN) Security Requirements Guide	2021-09-27

Details

Check Text ( C-7464r378233_chk )
View the configured security services. Compare the services that are enabled, including the port, services, protocols, and functions. If functions, ports, protocols, and services identified on the PPSM CAL are not disabled, this is a finding.

Fix Text (F-7464r378234_fix)
Ensure functions, ports, protocols, and services identified on the PPSM CAL are not used for system services configuration. View the configured security services. Compare the services that are enabled, including the port, services, protocols, and functions. Consult the product knowledge base and configuration guides to determine the commands for disabling each port, protocols, services, or functions that is not in compliance with the PPSM CAL and vulnerability assessments.

Fix Text (F-7464r378234_fix)

Ensure functions, ports, protocols, and services identified on the PPSM CAL are not used for system services configuration.

View the configured security services.

Compare the services that are enabled, including the port, services, protocols, and functions.

Consult the product knowledge base and configuration guides to determine the commands for disabling each port, protocols, services, or functions that is not in compliance with the PPSM CAL and vulnerability assessments.